ZeroToWP

Featured Image

Quick Definition

A featured image is the main visual that represents a WordPress post or page. It typically appears at the top of articles, in blog listings, and when shared on social media.

WordPress post editor where you set the featured image for a post

What Is a Featured Image?

A featured image (originally called "Post Thumbnail") is an image that represents an individual post, page, or custom post type in WordPress. The feature was introduced in WordPress 2.9 and renamed to "Featured Image" in WordPress 3.0.

Your theme determines where and how featured images are displayed. Common locations include:

  • At the top of the article — as a hero/banner image
  • On the blog page — as thumbnails in post cards
  • In category archives — alongside post titles and excerpts
  • On social media — when someone shares your link (via Open Graph tags)
  • In RSS feeds — as the post's visual preview

WordPress automatically generates multiple sizes when you upload an image: Thumbnail (150×150px), Medium (300×300px), Medium Large (768px wide), and Large (1024×1024px), plus the original full-size image.

Featured Images in Practice

To set a featured image: in the block editor, open the post settings sidebar (gear icon) and look for the "Featured image" panel. Click "Set featured image," choose from your Media Library or upload a new image, then click "Set featured image" to confirm.

Best practices:

  • Use a consistent size — most themes work best with 1200×630px or 16:9 ratio images
  • Optimize for speed — compress images before uploading (use WebP format if your theme supports it)
  • Add alt text — describe the image for accessibility and SEO
  • Every post should have one — posts without featured images look broken in most themes
  • Don't use text-heavy images — they don't scale well on mobile

Note: your theme must declare support with add_theme_support('post-thumbnails') in functions.php. All modern themes include this by default.

Why It Matters

Featured images are often the first thing visitors see. A compelling image increases click-through rates on your blog page and social media shares. A missing image makes your content look unfinished. See our image optimization guide for tips on keeping images fast, and our blog post writing guide for the complete publishing workflow.

Related Terms

ExcerptAn excerpt is a short summary of a WordPress post. WordPress can auto-generate one from the first 55 words, or you can write a custom summary to control exactly what readers see in search results and archives.PostA post is a piece of content in WordPress that appears in reverse chronological order — newest first. Posts are used for blog articles, news, tutorials, and any content that has a publish date.ThemeA WordPress theme is a collection of files that controls how your website looks — its layout, colors, fonts, and overall design. You can switch themes to completely change your site's appearance without losing any content.

Related Articles

How to Improve WordPress SEO: 15 Tips That Actually WorkYour WordPress site is live but traffic is flat. After 20 years of building and optimizing WordPress sites, here are the 15 things I do on every single project to get Google traffic flowing.Best Image Optimization Plugins for WordPress (2026 Compared)Images are the #1 reason most WordPress sites are slow. I've tested every major image optimization plugin and these are the 5 that actually deliver — with real compression numbers, WebP support, and honest free vs. paid breakdowns.How to Write a Blog Post That Ranks on Google (Step by Step)Most blog posts never get a single visitor from Google. I've written hundreds of posts over 20 years, and I've learned exactly what separates the ones that rank from the ones that collect dust. Here's my complete, no-fluff writing process.
← Back to WordPress Glossary